past paper Edexcel Biology B2 GCSE Structure 360 science

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Preview of past paper Edexcel Biology B2 GCSE Structure 360 science

First 278 words of the document:

Surname Initial(s)
Centre
Paper Reference (complete below)
No.
Signature
Candidate
No. H 1H
Paper Reference(s)
5016H/1H 5028H/1H Examiner's use only
Edexcel GCSE Team Leader's use only
Additional Science (5016H)
Biology (5028H) Question Leave
B2 ­ Topics 1 to 4 Number Blank
Higher Tier
1
2
Wednesday 5 March 2008 ­ Morning 3
Time: 30 minutes 4
5
Materials required for examination Items included with question papers
6
Calculator Nil
Instructions to Candidates
In the boxes above, write your centre number, candidate number, your surname, initial(s) and
signature, and complete the paper reference.
Check that you have the correct question paper.
Answer ALL the questions. Write your answers in the spaces provided in this question paper.
Do not use pencil. Use blue or black ink.
Show all stages in any calculations and state the units. Calculators may be used.
Include diagrams in your answers where these are helpful.
Information for Candidates
The marks for individual questions and the parts of questions are shown in round brackets: e.g. (2).
There are 6 questions in this question paper. The total mark for this paper is 30.
There are 12 pages in this question paper. Any blank pages are indicated.
Advice to Candidates
You are reminded of the importance of clear English and careful presentation in your answers.
Total
This publication may be reproduced only in accordance with
Edexcel Limited copyright policy.
©2008 Edexcel Limited. Turn over
Printer's Log. No.
N33028A
W850/R1536/57570 6/6/6/6/3/16,800
*N33028A0112*

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*N33028A0212*…read more

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1. Newts are small animals that live in ponds.
A newt can regenerate a leg if one is accidently cut off.
The diagrams show the regeneration of the leg over a 24 day period.
leg cut
off here
stump
(a) Name the type of cell division that results in the regeneration of a leg.
.......................................................................................................................................
(1)
(b) Describe the changes that occur in the stump to allow the leg to regenerate.
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2. Sonja, William and Stefan noticed that grass grows less well the nearer it is to a tree.
I think that the tree is using up the
minerals in the soil and so the grass
near it is not getting enough nitrates.
Sonja
I think that the tree is
using up carbon dioxide
I think that the grass close so the grass near it can
to the tree is not getting not get enough.
enough light.…read more

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(b) Explain why Stefan's idea is likely to be incorrect.
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(2)
(c) The three pupils decide to investigate Sonja's idea by varying the concentration of
nitrates given to samples of grass grown in the laboratory.
(i) Sonja's task is to find a range of nitrate concentrations in which to grow the
samples of grass.
What can Sonja do to work out a suitable range of nitrate concentrations?
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3. A model fermenter was used to investigate the effect of stirring the mixture at different
speeds.
Two pH probes were put into the fermenter, one at the top and one at the bottom.
motor
mixture of nutrients
and microorganisms
pH computer
probes
paddle
The paddles were spun at a speed of 10 revolutions per minute.
5 cm3 of acid was poured into the top of the fermenter.…read more

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(c) State why stirring the mixture effectively is a key process in the efficient use of a
fermenter.
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4. The graph shows the peak concentration of sulphur dioxide in the air of UK towns from
1990 to 2002.
800
700
Peak concentration of sulphur dioxide
600
500
in mg / m3
400
300
200
100
0
1990 1992 1994 1996 1998 2000 2002
Year
(a) Suggest one reason why the sulphur dioxide concentrations decreased between 1990
and 2002.
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(1)
(b) Suggest what effect this trend may have on lichen biodiversity.
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5. Scientists are studying whether it would be possible to live on the planet Mars.
They are designing a dome for 50 people to live in for up to ten years.
The dome must be completely self supporting. To test this, a dome will have to be built
on Earth.
Algae will be used to supply the food and oxygen for the dome.
On Earth, 19 m3 of active algae are required to supply the oxygen for one person for one
day.…read more

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